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Hormone-like substances (also exohormones, telergones) which, in the form of scents or attractants, unlike hormones, do not act in the body but are released externally. The name is derived from the words ferein = to transmit and hormãn = to drive or stimulate. In humans they play an important role in the reproductive drive, these are androstenone (sweaty smell of the male armpit), copulins (vaginal secretions) and trimethylamine (fish brine). Some of these sexually animating "scent attractants" only work on women, others only on men. In insects, pheromones trigger certain actions or social functions. For example, queen bees emit certain pheromones to worker bees that prevent them from rearing new queens. If the queen and thus the pheromone supply fails, this automatically starts the rearing of a successor or new queen.

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